We all know how you're all uber leet haxors right about now, but what about back in the day? We were all noobs once. We've all made really noobish mistakes... so I ask, what's yours?
Once (this was way back when I didn't know too much) I was using my PC, and I noticed all the fonts in my Internet Explorer window were tiny. I couldn't figure out why. I couldn't read any text, and I couldn't make the text bigger... so what did I do? Format and clean install of Windows.
I literally went through the entire format HDD, install OS, reinstall everything process... because my fonts were small. Man do I feel stupid.